Toyota 47910-34070
Load Proportioning Valve

The service procedure for the Load Sensing Proportioning and By-Pass Valve (LSP & BV) starts by disconnecting shackle No.2 from its bracket through bushing removal until shackle No.2 comes off along with taking out the 2 bushings and collar and finally the 2 bolts and shackle bracket. Use Special Service Tool: 09751-36011 to disconnect the 3 brake lines from the valve body. Then, remove the LSP & BV assembly after disconnecting its 2 valve bracket mounting bolts. The Blend Proportioning Valve requires three securing bolts to be removed after disconnecting the four brake lines when a torque of 29 Nm (296 kgf-cm, 21 ft. lbs.) has been achieved. Install the LSP & BV assembly by first placing its position and then securing it using the 2 valve bracket mounting bolts while torquing to 29 Nm (300 kgf-cm, 22 ft. lbs.). Specially designed tool 09751-36011 is used to connect the three brake lines where torque must be set to 15 Nm (155 kgf-cm, 11 ft. lbs.). Secure dimension A to 120 mm (4.72 inch) then fasten the lock nut to 13 Nm (130 kgf-cm, 9 ft. lbs.) afterward add the shackle bracket followed by 2 bolts secured at 29 Nm (300 kgf-cm, 22 ft. lbs.). Insert the shackle bracket by connecting its bushings with collar and shackle No.2 while tightening it to 13 Nm (130 kgf-cm, 9 ft. lbs.). Install the cushion retainer and its matching nut. Position the valve body by manually pulling down the load sensing spring which should move valve piston down smoothly until the piston lightly touches the spring. Tighten its mounting nuts to 13 Nm (130 kgf-cm, 9 ft. lbs.). Brake line bleeding must occur before checking and adjusting fluid pressure levels of both the LSP and BV.

Service and repair of the Brake Proportioning/Combination Valve begins with removing the valve bracket through its nut, washer, bolt and plate washers followed by the 2 nuts and 2 washers and set plate and valve bracket from the valve body. The valve spring can be disconnected through plier usage which removes the clip then the spring. Disconnect shackle No.1 and shackle No.2 by taking off the nut washer and bolt together with the load sensing spring and 2 plate washers and then lightly loosen the 2 nuts and plate washer plate to separate shackle No.1 from shackle No.2 The load sensing spring disassembly requires removal of 4 bushings and 2 collars in sequence followed by uninstallation of the load sensing valve boot and load sensing spring boot. Check the valve piston pin along with the load sensing contact surface for wear until it reaches 0.7 mm (0.028 inch) beyond the allowed maximum limit. When reconnecting the system install the load sensing valve boot and load sensing spring boot before placing the 2 collars followed by the 4 bushings while applying lithium soap-base glycol grease to all contact areas and aligning the load sensing spring correctly. First bolt shackle No.1 to shackle No.2 by fastening the lock nut and plate washer between the shackle components then tighten the upper nut to 13 Nm (130 kgf-cm, 9 ft. lbs.). The spring of the load sensing assembly should have 2 plate washers applied before the bolt installation, washer, and finally the nut which should be tightened to 18 Nm (185 kgf-cm, 13 ft. lbs.). Screw the load sensing spring into the load sensing valve using the clip before you install the valve bracket by establishing the set plate between the valve bracket and load sensing valve and then tighten the 2 washers and 2 nuts as a temporary step before installing the load sensing spring assembly followed by 2 plate washers bolt washer nut that should be torqued to 18 Nm (185 kgf-cm, 13 ft. lbs.).

Remove the valve bracket by taking off the nut, washer, bolt, and 2 plate washers, followed by the 2 nuts, 2 washers, set plate, and valve bracket from the valve body.